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Last active June 29, 2019 20:13
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[SCIP tips] A few SCIP tips that were a bit difficult to find, at least for me #scip
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scip-tips.md

  1. How to turn off presolving?

    R: SCIPsetPresolving(scip, SCIP_PARAMSETTING_OFF, true), ref.

  2. How to write the problem to file?

    R: Use SCIPwriteOrigProblem() for writing the original problem and SCIPwriteTransProblem() for the transformed problem in the current node. ref.

  3. How to turn off presolving?
    R: SCIPsetPresolving(scip, SCIP_PARAMSETTING_OFF, true), ref.

  4. Warning when catching and dropping event.
    R: If no filterpos argument in SCIPdropEvent, a -1 should be used.

    SCIP_CALL( SCIPcatchEvent( scip, SCIP_EVENTTYPE_BESTSOLFOUND, eventhdlr, NULL, NULL) );
SCIP_CALL( SCIPdropEvent( scip, SCIP_EVENTTYPE_BESTSOLFOUND, eventhdlr, NULL, -1) );

  5. SCIP only throws atomic events. The event in the SCIPcatchEvent() function can be a composite one, but when in the EVENTEXEC function, keep in mind that the output of SCIPeventGetType() is an atomic event (don't do if(SCIPeventGetType(scip) == SCIP_EVENTTYPE_NODESOLVED)).

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